I cannot do any work. Sometimes I feel sleepy after taking bath. Sometimes while walking in the road under the sun. My height is 173 cm and weight 69 kg. I have tested it and i can walk 5 hours continuously without any break at 4.5 km/hr speed. I take Bengali food and I do not drink, smoke. I take tea 4 - 5 cups - does not work. Sometimes I feel unable to concentrate any subject except youtube. Sleep and concentration disorder does not know any clock. Any time I try to sleep I fall asleep. PLEASE HELP! Any IDEA? Tea Coffee does not work.